// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(universal_impl_trait)]

use std::fmt::Debug;

trait InTraitDefnParameters {
    fn in_parameters(_: impl Debug) -> String;
}

impl InTraitDefnParameters for () {
    fn in_parameters(v: impl Debug) -> String {
        format!("() + {:?}", v)
    }
}

fn main() {
    let s = <() as InTraitDefnParameters>::in_parameters(22);
    assert_eq!(s, "() + 22");
}
